i have a 2000 v6 convertible, and have started having heater problems lately. As the car warms up from a cold start, i can feel the air from the heater getting warmer and warmer, but when it gets to a certain point, usually close to straight up on the temp gauge, the air suddenly gets cold, as if i had turned the temp dial all the way to cold. I've tried moving the knobs back to cold, then hot, and also just turning air systems off for a while then back on, and also every different setting (Max A/C, Norm A/C, Vent, Defrost, etc). nothing seems to get it working again. what's even more puzzling to me, is that after about 15 min or so of running at operating temp, the heat will come back on. trouble is, by that time i'm already where i was driving to, and i'm still cold. any suggestions on what the culprit may be here?

Is the fan working ok? If so, and the air is just cool, then it may be an air pocket in the cooling system. Other than that, Im not sure if your car has a valve between the heater hose and heater core or not. If so maybe it is sticking.

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